Transformer bell device.



C. E. CAMPBELL.

TRANSFORMER BELL DEVICE.

APPLICATION FILED SEPTA, 1915.

1,168,378, 7 Patented Jan. 18, 1916.

(m/155555; fave/77271": MEM M5515 QWZM z /fw'flw (-00 THE COLUMBIA PLANOGRAPH c0., WASHINGTON. D. c.

, nrran srarne earner carton.

CHARLES E. GAMPBELL, oFJ YNN. massaorrusnr'rs.

rneusron rs'r. BELL nr vIoE.--

. To all whom it may concern Be it known that I, CHARLES E. Chiar- BELL, a citizen of the United States, residing at Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Transformer Bell Devices, of which the following is a specification.

My invention relates to improvements in transformer-bell devices, and the object of my improvement is to produce a device for door-bell use that receives current from service mains and which involves a minimum of skill for installation, particularly with regard to the leads that 'connect'with the operating switch or push button.

In the accompanying drawings, Figure 1 is a front elevation of my improved transformer-bell device, the cover being removed from one ofthe bell members, disclosingthe bell mechanism, and the electricalconnec tions being indicated by broken. lines. Fig. 2 is a rear elevation of the'same. Fig. 3 is a diagrammatic representation of the parts and the electrical connections; 7

My improved transformer-bell device comprises a base 10 on which are mounted a transformer 11 at the middle portion and a pair of bell members 12, one on each side of the said transformer 11. The transformer 11 is inclosed in a suitable housing and comprises a pair of primary terminals in the form of leads 13 adjacent a pair of bushings 11, the free ends of which leads may be connected to the service mains, and a pair of secondary terminals at the lower end which are connected to a pair of binding posts 15 and also to the bell members 12 in a special manner to be described. The said binding posts 15 are exposed, suitably to receive the' leads for a circuit from the transformer, which may be a diminutive heating coil, or a signal lamp, or other low voltage device. The bell members 12 comprise a bell base 16 on which is mounted the usual bell mechanism having the usual internal connections, but which I have provided with a special arrangement of external connections in order to effect the purposes of my invention. The said mechanism comprises the bell 17, the vibrating.mem-' Specification of Letters Patent. are t Ja1i1 1, Application filed September 2.1915 serial m. 18,625.

are;

at the upper free end. The magnet 20 com- I prises the U-shaped core 25 and the coils 26. Various arrangements of details may be employed in operatively supporting the parts of the bell mechanism mentioned, which involves a proper use of insulating materials. The magnet 20 and the adjacent parts I inclose within a cover 27 which is of ordinary form construction and I provide a special arrangement of binding posts comprising one pair within the cover 27 and an other pair without the said cover, and'which are exposed and accessible. The pair of binding posts within the cover comprises a right hand inner binding post 28 connected to the vibrating member 19 and a left hand inner binding post 29, connected to one end of the magnet coil 26. The other of the magnet coils 26 is connected to the contactpost 21; Thus the inner binding posts 28 and 29- constitute essentially the terminals the ordinary arrangement in that the bind- 4; I

ing posts 28 and 29 thereof are under normal conditions covered and concealed, and

substantially inaccessible.

Considering the outer or exposed pair of binding posts, these comprise the right outer binding post 30 which is common with the inner right hand binding post 28, being connected therewith by the lead 31, at the rear of the base 10, and the left outer binding post 32. The said left outer binding post 32 and the left inner binding post 29 are connected by separate leads 33 with the secondary terminals of the transformer 11 and the binding post 15. The leads 33 are at the rear of the base 10, and concealed. The only exposed parts of the electrical connections are the transformer binding posts 15 which are alive and suitable for supplying current to special devices and the two pairs of bell binding posts 30 and 32, one for each bell member 12.

It will be noted that cross-connecting the bell binding posts 30 and 32 serves to close the electrical circuit from the transformer 11 through the bell member 12, wherefore leads may be run therefrom to a circuit closing device, which would generally be in the form of a push button, at any point desired to suit convenience. to say, a complete, uninterrupted lead will That is connect each one of the binding 'j o s t s,

and 32 with one of the terminals of the push button on other'form of currentclosing device, and for this reason the-two leads making the connections mentioned will be oi h eu e e g h, thus-p ittin twi s into which the transformer primaryleads 13' project and W ll-16h is suitable for hjous ing' 'the j oints b'ywhich the sai'clfilea ds and the "service -mai ns 'may' be connected. The branches from the service mains pass; through the bushing *14:,'s othat the lea'd or terminal box 34 dispensesfwith the usual terminal-box; adjacent thefiends of theiservice branches. A-"cover 35" of injsulating-rna-. teri-al be-provided forthetermjna l box;

374, the same being held place by suitable screws-36.

' Y Copiesof-this.patentmay:"Beiobtamdtor flvueontslarch, hy -gddxzessingithe "Q mmia si er fi'refenta claim; I asrny 'invention 7 1. In combination, a base: having ;a "ternnnal box, a transformer mourrtecl' on E the,

said base and'having primary leads extending intothesaid terminal box, a bell member I'nou'n'tedon the said base, a pair of ter- H m nalson the said base suitable for being;

connected to a push-button, and connections ,operatively, connecting the said terminals with the secondary ofthe said transform-er 2. A unitary transformer bell device compr s ng af'base, a pair otpush-but-ton t-er-- mmals, supplyterrn nals, atransfoi -mer;and

abell device supported by t-h'e said base, and

connections interconnecting the said terminals, transformer, and bell device such that: by supplying cur-rent to-the said sun plyterminals the transformer-Will serve to operate the mechanism off-the said bell menuand tlie mechanism :or the said bell member. s

her 'responsive'to "cross-connecting of the 7 said pushbutton; terminals.

transformer-bell levice comprising-- a -'pair of supply terminals-for being con- 'nected to servicemains, afb'ell 5m enfiber comprisingzabell andlapair Q-f'push button-ten: i

minals adjacent thereto, a transformer, and

connections interconnecting the said ter-' minals, bell imem'ber and transformer such that a" push 'button connected across the said pushbutton terminals will operatively connect t-he said bell-member with the said transformer a V I CAMPBELL.

Witnessesr i I BLAME L. Hanan,

lem-EL W'A'rsoN. 

